Table 3. The effect of altitude exposure on high-energy phosphates and pH in human skeletal muscle.

		PRE	POST
PCr (mM)	Resting	30.9±0.6	31.7±0.7
	Exercising	20.2±1.7	18.8±1.6
	After recovery	32.9±0.5	29.4±0.8 **
PCrt1/2 (s)	During recovery	20±1	19±2
Pi (mM)	Resting	2.6±0.2	3.0±0.2 *
	Exercising	11.6±1.8	12.9±2.2
	After recovery	1.3±0.2	1.5±0.1
ADP (µM)	Resting	27±2	19±2 **
	Exercising	53±5	54±8
	After recovery	20±2	24±2
ΔG'ATP (mM J−1)	Resting	−63.0±0.3	−63.5±0.2 *
	Exercising	−58.0±0.7	−57.4±0.6
	After recovery	−65.7±0.4	−64.8±0.3
pH	Resting	7.10±0.003	7.06±0.006 ***
	Exercising	6.99±0.03	7.00±0.02
	After recovery	7.08±0.01	7.04±0.01 **

Values are means ± SEM (n = 12).

*different from PRE at p<0.05;

**different from PRE at p<0.01;

***different from PRE at p<0.001. There were no significant effects of trekker/climber grouping.